My prog was borderline low, but my HCG didnt double.
It's a positive thing that your HCG is going up.
Try the pharmacist near the IVF clinic- the one near mine always has some ready.
My prog was 25.5, but went up immediately after I used the pessaries for 2 days.
Pity you are not in Melbourne, I have some here that are not needed for now.
Good luck hun